Some useful information on Time signal stations, from Gary (VE3TGH).
PDF attachment about 29 pages with all sorts of detail. Covers 25Khz to 20Mhz but misses WWV on 25mhz which occasionally appears on a temporary basis. Found it after Googling a time signal with callsign BPM heard on 10Mhz using the WebSDR in Holland. Turns out it was in China. Starting on Page 4 there are details about the individual stations.
Other interesting links:
http://www.utilityradio.com/stations/specials/ts-inh.htm with sound files
http://english.ntsc.cas.cn/rs/fs/200909/t20090917_39104.html Chinese time service
http://www.dxinfocentre.com/time.htm List from 2015, includes WWV on 25Mhz but nothing under 2.5Mhz.